Analysis Of No-load Leakage Coefficient And Armature Reaction Coefficient Of Permanent Magnet Generator

With the increase of global energy consumption and enhancing the conceptof environmental protection, the development and utilization technology of greenenergy has been rapid developed. Wind power generation has graduallydeveloped into an important part of the new energy. The wind generator plays animportant role in wind generator system as its main structure. The permanentmagnet synchronous wind generator has been widely used. It is difficult tomaster the no-load leakage coefficient and armature reaction coefficient becauseof the generator rotor magnetic circuit structure has so many types and thedistribution of leakage magnetic field and the armature magnetic field isrelatively complex. No-load leakage coefficient and armature reaction coefficientare major parameters in the motor design. In engineering fields, the calculationerrors often caused by the researchers who are often based on past experience tothe selection of the approximate value.Firstly, this dissertation introduces several typical structures of the rotormagnetic pole, and analyzes the main basis of the magnetic selection. In thedissertation, it not only proposes a method to calculate the no-load leakagecoefficient and armature reaction coefficient by using the finite element software,but also researches the electrical machine performance effect of no-load leakagecoefficient and armature reaction coefficient. In the second place, the dissertationtakes a3mw permanent magnet synchronous wind power generator as theresearch object, and build the calculate models of rotor magnetic circuit structurewhich including the surface type, built-in radial type and the hybrid by using theAnsoft Maxwell software. It also analysis the influence factors of different structures of no-load leakage coefficient and armature reaction coefficient. Theinfluence include the pole embrace, the magnetization direction length ofpermanent magnet, the length of air-gap and the effect of the no-load leakagecoefficient and armature reaction coefficient for the size of magnetic bridge.Finally, this dissertation summarizes the change rule of each type of magneticpole structure with no-load leakage coefficient and armature reaction coefficient,and comparing the magnetic pole structure, according to the various performanceindicators of the machine, thus, choose the rotor magnetic circuit structuresuitable for permanent magnet synchronous generator. The conclusions obtainedin this dissertation, it can provide the basis for the electromagnetic calculation inthe process of selection of the no-load leakage coefficient and the armaturereaction coefficient.